Printing telegraph apparatus



June 20, 1939. HQRE|BER 2,162,790

PRINTING TELEGRAPH APPARATUS Filed Nov. 13, 1956 2 Sheets-Shae lINVENTOR ALBERT H. REIBER ATTORNE June 20, 1939. A: E|BER 2,162,790

PRINTING TELEGRAPH APPARATUS Filed Nov. 13, 1936 2 Sheqts-Sheet 2 IATTORNE Patented June 20, 1939 PATENT OFFICE PRINTING TELEGRAPHAPPARATUS Albert H. Reiber, Evanston, Ill., assignor to TeletypeCorporation, Chicago, 111., a corporation of DelawareApplication-November 13, 1936, Serial No. 110,722

43 Claims.

The present invention pertains to printing tele- .graphapparatus andmore particularly to printing'telegraph receiving apparatus whereincharacters are printed upon a tape.

The principal object of the invention is to provide a printing telegraphmachine wherein the functions are performed in a reliable and efficientmanner by mechanism which is simple and economical to manufacture.

According to the present invention, the printing apparatus operates on atwo wire system in which one line wire is connected through one ratchetmagnet to a winding of a printing magnet, and the other line wire isconnected through a second ratchet magnet to a second winding of theprinting magnet, which windings are connected to ground. Characterprinting is effected only when both windings of the printing magnet areenergized. Each character signal consists of two parts; namely, steppingimpulses and a prolonged printing impulseboth of which occurconcurrently on both line wires. For example, the stepping impulsesoccurring on one line wire con- .trol the stepping of a type wheelone-sixth of a revolution per impulse, and the stepping impulsesoccurring on the second line. wire control the stepping of the typeWheel one-thirty-sixth of a revolution per pulse. These positioningimpulses exist on both line wires simultaneously, but the impulses onone line are staggered with respect tothe impulses on the other line soas not to energize the print magnet prematurely. The maximum number ofimpulses on either line necessary to step the type wheel to any one ofits thirty-six positions from its zero position is five. The second partof the character signal consists of aprolonged impulse occurring on bothlines simultaneously and functions to operate the printing-.magnet whichalso acts to restore the type wheel and selecting mechanism to normal orstarting position. I

The selecting. mechanism of the printer consists of a rotatablecylindrical part arranged in axial alignment with the type wheel shaftand provided with a helical series of curved arms each provided with anumber of steps. These arms cooperate with a coordinately positionablestop arm to determine the character to be printed. Hence, the selectionof the character is determined by the application of the principle ofcoordinates; that is, the stop is movable under the control of one ofthe line magnets in one direction and. in another direction under thecontrol of the otherllin'e magnet so that the movement of the stop ineither direction, predetermined by the number of stepping impulses I oneach line required, establishes a stopping position for the rotatablecylindrical part which constantly tends to rotate unless stopped by thecoordinately positionable stop.

The above and other objects of the invention .will be apparent from thefollowing description when taken in conjunction with the accompanyingdrawings, wherein like reference characters designate similar partsthroughout the several 10 views, and in which,

Fig. 1 is a rear elevational view of the printer according to thepresent invention illustrating the arrangement of the component parts;

Fig. 2 is a plan. view of the printer shown in 15 Fi r Fig. 3 is afragmental cross-sectional view taken substantially on line 33 of Fig.2;

Fig. 4 is a partial front elevational view of the printer according tothe present invention;

Fig. 5 is a cross-sectional view taken substantially on line 5-5 of Fig.4;

Fig. 6 is an enlarged perspective view of the selecting mechanism;

Fig. 7 is a diagrammatic representation of the 2 5 ing a mounting plateI2 through the instrumentality of a bar I3 (Fig. 5). A pair of posts I4and I5 fixed to the mounting plate I2 support a bar It which provides ajournal bearing for shafts I'I, I8, and I9. Shaft I! is journalled atits end remote from bar It in a bracket 2I (Fig. 5) to which is fixed tomounting plate I2. Shafts I8 and I9 are journalled at their ends remotefrom bar I6 in the mounting plate I2.

Shaft I9 supports a sleeve 22 which carries integral therewith a ratchet23. riveted one end of a fiat spiral spring 24, the other end of whichis riveted to a cage member 25 which is fixed to a gear 26 in suchmanner as to form a cage or enclosure for spring 24. Thus, when ratchet23 is rotated in a counterclockwise direction by a pawl 21, in a mannerwhich will hereinafter become apparent, it tendsto wind up spring 24,which under certain predetermined conditionsywill cause gear 26 torotate in a similar direction. ,Gear 26 meshes with a pinion 28 Tosleeve 22 is 15 which is carried on shaft l8 and fixed to a gear 29, andwhich in turn meshes with a pinion 3| (Fig. 2) fixed to shaft |1.

Also secured to shaft |1, between bracket 2| and mounting plate l2, is atype wheel 32 (Figs. 2 and 5) which has associated therewith and fixedlyconnected thereto a multi-toothed or star wheel 33. Fixed to shaft i1intermediate mounting plate l2 and the bar I6 is a cylindrical member 34having a helical series of curved arms 35. Although, according to thepresent embodiment, each one of the curved arms 35 is provided with anintegral hub portion and is mounted on shaft l1, and the several armsare arranged in laminated manner, it is understood that an integralcylindrical portion or part 34 may be provided having the helical seriesof curved arms 35 arranged thereon. Each one of the arms 35 is providedon its convex surface with a plurality of serrations or steps 36 whichcooperate or coact with the extremity of a selecting finger or stopmember 31 to provide a stop for arresting the rotation of the cylinder34 at various positions depending upon the particular coordinateposition of the extremity of stop member 31, as will be presentlydescribed.

From the description of the apparatus so far, it is observed from Fig. 1that spring 24, after it has had sufficient power stored therein by theaction of pawl 21 on ratchet 23, constantly tends to rotate gear 26 in acounterclockwise direction, imparting through pinion l8 and gear 29,counterclockwise rotation to gear 3|, and hence to cylinder 34. Cylinder34 thus constantly tends to rotate in a counterclockwise directionunless stopped by the coaction of one of its ams 35 with stop member 31.

Selecting finger or stop member 31 is adapted to assume any one of thethirty-six coordinate positions symbolically represented in Fig. '1 inthe followng manner: Member 31 is integral with a member 38 afiixed to'a shaft 39 which is slidable axially in its bearings in journal plate l6and. mounting plate |2 (Fig. 5). To increase its bearing support inplate l2, a collar 4| is provided which is fixed to plate l2, thusaugmenting the bearing support for the slidng motion of shaft 39. Theleft end of shaft 39 is pivotally articulated to the vertical arm of alever 42, as shown in Fig. 5. Lever 42 is pivotally carried at 43 on abracket 44 mounted on base plate I The arcuate edge of the depending armof lever 42 is provided with a plurality of ratchet teeth 45 which coactwith an operating pawl 46 and a detent 41. Pawl 46 is pivoted at 48 tothe armature 49 of a magnet 5| carried on bracket 52 mounted on baseplate I and is constantly urged into engagement with teeth 45 by aspring 53 distended between a bracket 54 mounted on base plate H and anarm 55 of pawl 46. Also distended between arm 55 and mounting plate I2is a spring 56 which functions as a retractile spring for armature 49.Detent pawl 41 is pivotally mounted at 50 (Fig. 1) to bracket 44 and isprovided with a spring (not shown), similar to spring 53, which biasespawl 41 into engagement with teeth 45.

Lever 42 is constantly biased in a clockwise direction by a spring 51.When magnet 5| is energized by one of the stepping impulses, it pulls upits armature 49 against the tension of spring 56 thus advancing pawl 46toward the left (as viewed in Fig. 5) to engage the next tooth in theseries of teeth 45. Upon deenergization of magnet 5| at the terminationof a stepping impulse, the armature 49 is retracted by its spring 56against its adjustable stop screw 58. Pawl 46, as a result thereof, isurged rightwardly causing lever 42 to rotate a predetermined angularamount against the action of its spring 51 which is less powerful thanspring 56 to cause, in turn, shaft 39 to slide axially toward the leftan amount corresponding to the distance between one arm 35 and the nextarm 35. After lever 42 has been moved a unit angular amount by pawl 46,it is held thereat by detent 41. Likewise, the receipt of each steppingimpulse directed to magnet 5| will cause lever 42 to rotatecorresponding angular amounts imparting in turn to shaft 39corresponding axial movements so that upon the receipt of eachsucceeding impulse, stop member 31 will be moved from the plane of onearm 35 to the next one and so on through the successive series ofstepping impulses. In this manner transitional movement is imparted tomember 38, and hence to stop member 31.

The clockwise rotation of member 38, carrying member 31, in astep-by-step manner is controlled by electromagnet 59 (Fig. 1) whichresponds to stepping impulses over a second line wire. To achieve thisresult, member 38 is provided with a portion 6| which is provided on itsouter arcuate surface with a plurality of elongated parallel ridges 62which simulate ratchet teeth. Cooperating with teeth 62 are a pawl 63and a detent member 64. Pawl '63 is pivotally connected at 65 toarmature 66 of the electro-magnet 59 and is normally biased intoengagement with teeth 62 by a spring 61.

When magnet 59 is energized upon the receipt of a stepping impulse,armature 66 will be pulled against the action of spring 61 (Fig. 3)causing the tooth 68 of pawl 63 to be moved to the left an amonutequivalent to one tooth. Upon the rightward movement of pawl 63, thebeveled end 14 thereof strikes against a fixed cam member so that pawl63 is constrained in its engagement with teeth 62. The location of cam15 is so fixed as to govern the exact movement of pawl 63 and hence, themember 38. Cam 15 may, if desired, be carried by an adjustable armmounted on the bar l6. As indicated in Figs. 2 and 5, however, camprojection 15 is shown as fixed to the arm 16 which is shown as integralwith bar 16. Upon deenergization of magnet 59 at the termination of astepping impulse, armature 66 will be released and spring 61 will urgearmature 66 and pawl 63 rightwardly (Fig. 3), causing tooth 68 to'rotatemember 38 in a counterclockwise direction about shaft 39 a unit angularamount. Each repetition of the action of magnet 59 in response tosuccessive stepping impulses will cause member 38, and hence stop member31, to rotate corresponding unit angular amounts against the action ofspring 69. Each time member 38 is moved an angular amount, it is heldthereat by the latching pawl 64 which is pivoted at 1| to post 12 (Fig.3) carried on mounting plate |2. Detent 64 is normally urged intoengagement with teeth 62 by its spring 13.

When the printing impulse is received, a printing magnet 8|, Fig. 1,becomes energized and causes its armature 82 to be pulled up. Armature82 is suitably mounted on a bracket 83, secured to mounting plate l2, towhich armature 82 is pivoted at 84. Fixed to armature 92 is an operatingarm 85 which carries near its outer extremity an eccentric adjustingscrew 86 which cooperates with a printing lever 81 (Figs. 1 and 5). Asindicated more clearly in Fig. 5, the printing lever 81 ispivotally'supported at 88 to a bracket 89 fixed to the mounting plateI2. Printing lever 81 is normally biased to its clockwise position by aspring 9|. v H v Arm 92 of printing lever 81 is conformed in a U-shapedmanner, as Viewed in Fig. 5, between pivot 88 and adjusting screwf86 soas to avoid intervening mechanism. Thus, when printing magnet 8| isenergized, the downward movement of the eccentric screw 86, caused bythe operation of arm 85, will impart counterclockwise rotation toprinting lever 81 against the action of its return spring 9|. The impactof extremity 93 of lever 81 with a platen 94 causes the platen 94 to bethrownsharply upwardly against the character on type wheel 32 which hasbeen selectively positioned for recordation. Platen 94 is carried at theextremity of a lever 95 (Fig. 4) pivoted on a stud 96, carried inmounting plate I2 and is gravitated back to its unoperated position sothat when it is struck a sharp impact by extremity 93 of printing lever81, it is free to bound against the type wheel 32 to produce printing,the printing lever 81 being returned immediately by its spring 9| upondeenergization of printing magnet 8|, a retractile spring 11 acting toreturn operating arm 85 to its upward position. Adjacent the extremityof printing lever 81 is a stabber portion 91 which coacts with the starwheel 33 to properly align the type wheel 32 during the printingoperation. In addition to the function of thus properly aligning thetype wheel 32, the stabber 91, due to the particular structuralrelationship between the star wheel 33 and stabber 91, acts to hold thetype wheel shaft, and hence cylinder 34, momentarily until member 31 hasreturned to its normal zero position in readiness for a ,Suc ceedingpositionment. To achieve this time delay the teeth on the star wheel aremade deeper, so

that the complete withdrawal of stabber 91 from the teeth will not beattained until the member 31 has been fully returned to its zeroposition. A yieldable guard 98 is mounted between platen 94 and typeWheel 32 to prevent fringe printing of adjacent characters. The verticalmovement of lever 81 is guided by a guide bracket I88 secured tomounting plate I2.

Operating arm 85 is provided at its extremity beyond the eccentric screw86 with means for effecting the restoration of the selecting elements 34and 38 to normal, and to provide motion to the pawl 21 to wind up thespring 24. The means provided comprises an extension 99, Figs. 1 and 5,which acts when arm 85 is operated downwardly by magnet 8|, to disengagepawl 46 and detent 41 from teeth 45 permitting spring 51 (Fig. 5) torestore, through lever .42, shaft 39 to its rightward position. Theaforementioned means carried at the extremity of operating arm 85 alsocomprises a laterally disposed portion I8 I- (Fig. 5) which is providedwith notches I82 and I83 adapted to receive the ends of pawl 63 anddetent 64, respectively, so that, when portion I8I is actuateddownwardly, upon the operation of magnet 8|, it functions to disengagepawl 63 and detent 64 simultaneously from the teeth 62, permittingmember 38 to respond to the pull of its biasing spring 69 to rotateclockwise until portion BI is arrested by a stop projection I84 integralwith detent 64.

End portion I8I is further provided with a horizontal notch I85 whichreceives the extremity of arm I86 of a lever I81 pivotally mounted atI88 upon a stud which extends from the mounting plate I2. Lever I81 alsohas an arm I89 which carries at its extremity a shoulder screw H8jection I I5. Thus, upon actuation of the operat ing arm 85 downwardlyby magnet 8|, the end portion I8I of arm 85 will, through notch I85 andend I86, cause lever I81 to rotate in a clockwise direction about itspivot I88, thus, through spring I I3, causing pawl 21 to move upwardlyto impart rotation to ratchet 23, which in turn will wind the spring 24,storing energy therein. A detent pawl I I6 biased by a spring I I1 isprovided to prevent the unwinding of spring 24, except under the controlof the stop member 31. In this manner, sufficient energy is restored inspring 24, upon each operation of the printing magnet 8|, to compensatefor the energy expendedin .rotating the type wheel shaft I1 during eachcharacter selection. v

Pivotally connected to operating arm 85 in the proximity of eccentricscrew 86 is a link II8 depending therefrom, to the lower extremity ofwhich is pivotally connected arm II9 of a tape feed bail lever I2Ipivotally carried on a stud I22 screwed to mounting plate I2. Bail I2Iis also provided with an arm I23 which carries at its extremity a tapefeed pawl I24. Pawl I24 by a spring- I25 is normally biased in aclockwise direction (Fig. 1) into engagement with a tape feed ratchetwheel I26 pivoted on shaft I21, Figs.

1 and 4, suitably supported in mounting plate I2.

A detent I28 is provided for ratchet wheel I26, biased by aspring I38.Carried on shaft I21 on the side of mounting plate I2, opposite to thaton which ratchet I26 is carried, is a flanged tape feed roller I28.Cooperating with tape feed roller I28 is a pressure roller I29 carriedon a lever I3I provided with a finger piece I32 for manual release ofpressure. Pressure is imparted by roller I29 against feed roller I28 dueto the biasing action of a spring I33 upon lever I3I. As viewed in Fig.4, a tape I34 is directed from a source (not shown) around a guideroller I35, over the feed roller I28, through the printing region,thence over the member 95 which is provided at its hub portion withguide flanges I36. An inking roller I31 is carried on the end of a leverI38, pivoted at I39 to mounting plate I2. The inking roller I31 isnormally tensioned against type wheel 32 by a spring I4I upon lever I38.

A feature of the invention consists in provid ing a braking means forthe type wheel 32 to prevent back slipping. As shown in Fig. 4, thebraking means comprises a lever I42 pivoted at I43 to the mounting plateI2. A spring I44 normally tends to urge lever I42 in a clockwisedirection so as to hold the outer edge I46 of lever I42 against the hubI45 of type wheel 32. In this manner, as type wheel 32 rotates duringits selective operation in a clockwise direction, it tends to urge leverI42 counterclockwise against the. action of spring I44. However, whenthe selectionhas been made, any tendency of type wheel 32 to reboundisprevented by the toggling action between hub I45 and edge I46 of leverI42 caused by the frictional engagement between hub I45 and edge I46.

Referring now to Fig. 8, theterminals I5I and of magnet 8|.

I52 are connected to wires No. I and No. 2, respeotively, of the signalline. Thus, the signalling impulses transmitted over line No. -I areconducted through terminal I5I, over conductor I53, through winding ofmagnet 5|, over conductors I54 and I55, through the winding of printmagnet 8|, thence to ground. Introduced in the circuit just described isa contact I56, connected to ground, controlled by the magnet 5 I. Thecontact I56 is shown in Figs. 1 and 5, and is controlled by an insulatedstud I5'I carried on armature 49. The function of this contact is toshort circuit the printing magnet BI during the reception of steppingimpulses over line I52.

Similarly, the impulses transmitted over line wire No. 2 are receivedthrough terminal I52, thence over conductor I58, through winding ofmagnet 59, thence over conductors I 59 and I55, through the winding ofprint magnet 8|, to ground. There is also introduced in the circuit justdescribed, a contact I6I, connected to ground, which is controlled bymagnet 59. Contact I6I is shown in Fig. 1 as controlled by an insulatedstud I62 carried on armature 66. The function of contact I6I is similarto I56, which is to short circuit the magnet BI during the reception ofstepping impulses over line I5I. When it is recalled, as shown in Fig.9, that the stepping impulses (indicated I63 and I64) of lines Nos. Iand 2 are staggered, the function of contacts I56 and I6I will beapparent. For example, when a stepping impulse is received by magnet 5|,its armature 49 will be attracted to cause contact I56 to open, thuscausing the current impulse to pass over conductors I54 and I59, throughcontact I6I, to ground, and not through the winding In a similar manner,a stepping impulse received by magnet 59 will cause the attraction ofarmature 66, and thus open contact 'I6I, directing the impulse overconductors I59 and I54, through contact I56, to ground, short circuitingthe magnet III. The prolonged printing impulses I65 and I66 (Fig. 9) arereceived simultaneously over the two line wires, and magnets 5| and 59are operated simultaneously, opening both contacts I56 and I6I, thuspreventing the short circuiting of magnet 8I and causing the currentover both lines to pass over conductor I55, through winding of printingmagnet 6| to ground.

General operation Preparatory to message reception, the stop member orselecting finger 31 must be at its zero or normal stop position whereinthe type Wheel 32 is arrested in its blank position; that is, with theblank portion of the type wheel opposite the printing platen 94. Eachsquare of the diagram shown in Fig. 7 corresponds to a particularcharacter on the type wheel 32. The normal stop position of the member37 is that position indicated in dotted outline I6I, shown in Fig. '7,wherein the pointer assumes a position represented by the upperright-hand square of the diagram I68. In this position, the tip ofmember 31 coacts with that step 36 closest to the axis of shaft I! onthat curved arm 35 nearest to mounting plate I2. For purposes of thisdescription, the step 36 in each arm 35 closest to the axis of shaft IT,as indicated in Fig. 6, will be designated as step No. II, and the othersteps 36 in the order of their distance from the axis of shaft I'I willbe designated steps Nos. I, 2, 3, 4, and 5. Likewise, the curved arm 35nearest to the mounting plate I2 will be designated as arm No. 9, andcorrespondingly, the arms with respect to their the position it isshownin solid lines in Fig. 7. 1

Assuming that the member 3'! is in the dotted position I67 of Fig. 7,which is the normal zero position (or that position shown in Figs. 1 and5), and five stepping impulses are transmitted over the line wireconnected to terminal I52 (Fig. 8) magnet 59 will be actuated five timesto cause pawl 63 to actuate member 36 five angular steps to bring member31 to that position indicated 6-5 in Fig. 7 Which signifies that thepointer is opposite the sixth step (step No. 5) of arm No. 9. As anotherexample, assume that five stepping impulses are received over the linewire connected to terminal I5I (Fig. 8) and none over the other linewire. 'The magnet 5| will be actuated five times so as to cause pawl 46to move lever 42 five angular steps, moving through shaft 39 the member3'! in position with arm No. 5. In this condition, the motor spring 24will rotate the cylinder 34 until step No. '6 of arm No. 5 coacts withthe tip of member 37, which is that position corresponding to square 59in Fig. 7, which signifies that the pointer is positioned to coact withstep No. II'of arm No. 5. Each one of the hyphenated numeraldesignations in Fig. 7 indicates the arm and step to which the square inthe diagram corresponds, the arm being indicated first and the steplast.

As a further example, assume that four stepping impulses are receivedover the line wire connected to terminal I52, and five stepping impulsesare received over line wire connected to terminal I5I. In response tothis signal, the magnet 59 will be operated four successive times, whichwill cause pawl 63 to move member 38, and hence stop member 31 will movethrough four angular positions, which corresponds to the fifthhorizontal row from the top in Fig. 7. Now, the five impulses receivedthrough terminal I5I will cause pawl 46 to operate lever 42, throughfive angular steps causing, through shaft 39, member 38, and hencemember 31 to move to a point corresponding to the sixth vertical rowfrom the right in Fig. '7. In response to this signal, the tip of member31 should assume a position corresponding to the square indicated 5-4 inFig. 7, which indicates a position representative of the step No. 4 onarm No. 5. From the foregoing, it will be apparent that the selectingmechanism of the present invention operates on the coordinate principle,and that the impulses received by magnet 5I control the transitionalmovement of stop member 3'! and the impulses received by magnet 59control the rotational movement of stop member 31.

In actual operation, a constant torque is applied to the cylinder 34 bythe power spring 24 and in whichever manner member 3'! is moved, whetheraxially or circumferentially (that is, transitionally or rotationally),the member 31 will slide oif a step with which it is in contact toassume a new position in space corresponding to the stepping impulsereceived, whereupon the cylinder 34 will immediately rotate until a newstep on a new arm comes into contact with the new position of the member31.

Moreover,.when the prolonged printing impulse is received over both linewires, the operating arm 85 is operated to cause the actuation ofprinting arm 81 and simultaneously to effect the disengagement of pawls'46 and63 and their associated detents 41 and 64 respectively, to permitmember 31 to respond to the action of its return springs 51 and 69 toreturn member 31 to a position represented in dotted lines by theposition I61 in Fig. 7 which corresponds to that position shown in Fig.1.

To compensate for a condition of operation that exists in the embodimentof the invention illustrated, a ridge or stop I69 (Fig. 5) is providedadjacent step No. II of arm No. 0 which acts to hold the cylinder 34 atthe zero stop position until the termination of the prolonged printingimpulse. To illustrate, when the prolonged printing impulse is receivedall the magnets; namely, 5|, 59, and 8|, remain energized for theduration of the printing impulse. 46 and 63, and detents 41 and 64, areheld disengaged from teeth 45 and 62, respectively, permitting member 31to be returned to its zero position, as previously described, by springs51 and 69. However, member 31 is moved by spring 51 beyond arm No. II toengage projection I69 (Fig. 5). Therefore, to bring member 31 into itsproper position in alignment with step No. 0 on arm No. 0, it isnecessary to permit the engagement of pawl with the first tooth of theplurality of teeth 45 before the armature 49 is released. To achievethis result, the magnets 59 and 8| are caused to become deenergizedbefore magnet 5| by making the printing impulse on the line wireconnected to terminal I52 slightly shorter. Thus, upon the release ofarmature 82 of printing magnet 8I, and the consequent raising ofoperating arm 85, pawl 46 will be permitted to become engaged with atooth on lever 42, while the magnet 5| is still energized. Then upondetermination of the printing impulse on the line wire connected toterminal I5I, and the consequent deenergization of magnet 5|, the lever42 will be rotated one angular step so as to bring member 31 intoposition with step No. 0 of arm No. II. Another manner of achieving thisresult is to permit the member 31 to be returned to the position whereinIt will engage ridge I 69, and then prior to the transmission of asucceeding character signal. an in" itial impulse can be transmittedover the line wire connecting with terminal I5I (Fig. 8) to energizemagnet 5| to move the member 31 into alignment with arm No. I].

Upon the receipt of the prolonged printing impulse, the feeding pawl I24is retracted so as to pick up the next tooth on the ratchet I25.Likewise, the power spring pawl 21 is retracted so as to pick up thenext tooth on ratchet 23. Then upon the release of operating arm 85under the action of spring 11, pawl I24 will rotate ratchet I26 one stepto impart a movement of one character space to the tape, and the pawl 21will rotate ratchet 23 one step to store further energy in the powerspring 24.

Although the present invention has been disclosed in connection with aspecific embodiment thereof, it is understood that such embodiment ismerely illustrative and not restrictive, and that all forms comingwithin the scope of equivalency of the appended claims are intended tobe covered by the invention.

What is claimed is:

1. In a selector, a rotatable shaft, a' cylinder carried by said shafthaving projections thereon, a reciprocable pawl, and means for movingsaid pawl longitudinally of the cylinder for determining the stopposition of said shaft.

2. In a selector, a rotatable shaft, a cylinder carried by said shafthaving a helical series of In this condition, the pawls arms eachprovided with anumber of steps, a

reciprocable pawl, and means for moving said pawl longitudinally of thecylinder for determining the stop position of said shaft.

3. In a selector, a rotatable shaft, a cylinder provided with helicallyarranged projections cooperatively related to said shaft, a reciprocablepawl, and means for moving said pawl relatively to said projections fordetermining the rotatable positioning of said shaft.

4. In combination in a printing telegraph receiver, a dually controlledtype wheel, electromagnetic means responsive to signal impulses forcontrolling the movement of said type wheel, means comprising arotatable cylindrical member having a helical series of arms eachprovided with a number of steps, and a coordinately positionable stopmember controlled by said electromagnetic means adapted to cooperatewith said arms to determine the character to be printed.

5. In the operation of a type wheel printer, a

method of actuating a type wheel to an ultimate position for printingwhich comprises applying a continuous torque to the type wheel,controlling the release of the type wheel for rotation intermittentlythrough the instrumentality of a coordinately positionable stop member,and summating the angles of rotation of the type wheel at each releasethereof.

6. In a selector, a rotatable shaft, a cylinder carried by said shafthaving projections thereon, a pawl, and means for imparting rotationaland translational movements to said pawl, whereby said pawl is adaptedto cooperate with the projections on said cylinder to determine the stopposition of said shaft.

' 7. In a selector, a rotatable shaft, acylinder carried by said shafthaving a helical series of arms each provided with a numberof steps, astop element, and means for imparting rotational and translationalmovements to said stop element, whereby said element is adapted tocooperate with said steps to determine the stop position of said shaft.

8. In a selector, a rotatable shaft, a cylinder carried by said shafthaving and translational movements to said stop element, and signalcontrolled means for operating said means to govern the ultimatestoppingposition of said shaft.

9. A method of actuating a type wheel printer which comprises applying acontinuous torque to a type wheel, restraining the type wheel fromrotating, controlling the release of the type wheel for rotationintermittently through the instrumentality of a coordinatelypositionable stop member, and summating the angles of rotation of thetype wheel at each release thereof.

10. In a printing telegraph receiver, a member having a helical seriesof arms, each provided with a plurality of abutting surfaces, anescapement mechanism for controlling the rotation thereof, a motordriven shaft for rotating the type wheel, and a signal responsiveselector mechanism for controlling the escapement mechanism.

11. In a printing telegraph receiver, a rotatable type wheel, a memberhaving a helical series of arms for controlling the rotation thereof, asingle stop element cooperable with said arms for controlling saidmember, and a signal responsive means for controlling said stop element.

12. In a printing telegraph receiver, a rotatable type wheel, a memberhaving a helical series of arms for controlling the rotation thereof, astop projections thereom. V a stop element, means for impartingrotational element, means for imparting rotational and translationalmovements to said element, whereby said element is rendered cooperablewith said arms for controlling said member, and a signal responsivemeans for operating said means.

13. In a printing telegraph receiver, a rotatable type wheel, anescapement mechanism for con trolling the rotation thereof, a firstsignal responsive means for controlling said escapement mechanism toeffect the rotation of said type wheel through a single character step,and a second signal responsive means for controlling said escapement toeifect the rotation of said type wheel through a predetermined pluralityof character steps.

14. In combination in a printing telegraph receiver, a dually controlledtype wheel, a first electromagnetic means responsive to signal impulsesfor controlling the movement of said type wheel in one manner, a secondelectromagnetic means responsive to signal impulses for controlling themovement of said type wheel in another manner, a third electromagneticmeans for controlling the printing of the. selected character, and meanseffective only when said first and second means are operatedsimultaneously to render said third means effective.

15. In a selector, a rotatable shaft, a cylinder carried by said shafthaving projections thereon, a stop element cooperable with saidprojections and capable of rotational and translational movements, afirst signal responsive means to effect the rotational movement of saidelement, and a second signal responsive means to effect thetranslational movement of said element to cooperate with said firstsignal responsive means to govern the ultimate positionment of said stopelement to determine the stopping position of said shaft.

16'. In a selector, a rotatable shaft arrestable in any one of aplurality of character stop positions, a cylinder carried by said shafthaving projections thereon less in number than the available number ofcharacter stop positions, a recip- 1 rocable pawl for arresting saidshaft, and means for moving said pawl longitudinally of the cylinder fordetermining the stop position of said shaft.

17. In a selector, a rotatable shaft arrestable in any one of aplurality of character stop positions, a cylinder carried by said shafthaving a helical series of arms less in number than the number ofcharacter stop positions, each provided with a number of steps, areciprocable pawl for arresting said shaft, and means for moving saidpawl longitudinally of the cylinder for determining the stop position ofsaid shaft.

18. In a selector, a rotatable shaft arrestable in any one of aplurality of character stop positions, a cylinder carried by said shafthaving a helical series of arms less in number than the number of'character stop positions, each provided with a number of steps, acoordinately position,- able stop member for arresting said shaft, andmeans to cause said member to cooperate coordinately with said steps todetermine the stop position of said shaft.

19'. In a selector, a rotatable shaft arrestable in any one of aplurality of character stop positions, a cylinder carried by said shafthaving projections thereon less in number than the number of characterstop positions, a pawl for arresting said shaft, and means for impartingrotational and translational movements to saidstop elements,

whereby said pawl is adapted to cooperate with the projections on saidcylinder to determine the stop position of said shaft.

20. In a selector, a rotatable shaft arrestable in any one of aplurality of character stop positions, a cylinder carried by said shafthaving projections thereon less in number than the number of characterstop positions, a stop element for arresting said shaft, means forimparting rotational and translational movements to said stop element,and signal controlled means for operating said means to govern theultimate stopping position of said shaft.

21. In a selector, a rotatable shaft arrestable in any one of aplurality of character stop positions, a cylinder carried by said shafthaving projections thereon less in number than the number of characterstop positions, an escapement mechanism for controlling through theinstrumentality of said projections the rotation of said cylinder toarrest said shaft, and a signal responsive selector mechanism forcontrolling the escapement mechanism to determine the stop position ofsaid shaft.

22. In a printing telegraph receiver, a rotatable type wheel providedwith a plurality of characters, a member having a series of arms less innumber than the number of characters on said type wheel for controllingthe rotation thereof, stop means cooperable with said arms forcontrolling said member, and a signal responsive means for controllingsaid stop means.

23. In a selector, a rotatable shaft, arms having a plurality ofabutting surfaces arranged around said shaft, and a single meanscooperable With said surfaces to determine the stop position of saidshaft.

24. In a selector for stopping a rotatable shaft in any one of aplurality of character positions,

series of armsless in number than the number of character stop positionshelically arranged around said shaft, each arm provided with a pluralityof abutting surfaces, and means cooperable with said surfaces todetermine the stop position of said shaft.

25. In a selector for stopping a rotatable shaft, a'cylinder carried bysaid shaft having a helical series of arms each provided with aplurality of abutting surfaces, and means cooperable with said surfacesto determine the stop position of said shaft.

26. A selecting element comprising a series of spirally arranged stoparms each having an involute conformation and a plurality ofprogressively disposed abutments on each of said arms.

27. In a selector for stopping a rotatable shaft, a cylinder carried bysaid shaft comprising a series of spirally arranged stop arms eachhaving an involute conformation and a plurality of progressivelydisposed abutments on each of said arms, and a coordinately positionablestop member cooperable with said abutments to determine the stopposition of said shaft.

28. In a selector, an element comprising a series of spirally arrangedstop arms each having an involute conformation and a plurality ofprogressively disposed abutments on each of said arms, and meanscooperable with said abutments, said element and means movablerelatively to each other to determine the stop position of said shaft.

29. In a selector for stopping a rotatable shaft, a cylinder carriedbysaid shaft having a helical series of arms each provided with aplurality of abutting surfaces, and means cooperable with said surfaces,said means and said cylinder mov able relatively to each other todetermine the stop position of said shaft.

30. In a selector, a rotatable shaft, arms having a plurality ofabutting surfaces arranged around said shaft, and a coordinatelypositionable means cooperable with said surfaces to determine the stopposition of said shaft.

31. In a selector, a rotatable shaft arrestable in any one of aplurality of character stop positions, a cylinder carried by said shafthaving a helical series of arms less in number than the number ofcharacter stop positions, each provided with a number of steps, acoordinately positionable stop member for arresting said shaft, andmeans to control the coordinate positionment of said member to establishthe cooperative relationship between said member and said steps todetermine the stop position of said shaft.

32. In a selector for stopping a rotatable shaft, a cylinder carried bysaid shaft having a helical series of arms each provided with a numberof steps, and a coordinately positionable stop member adapted tocooperate with said steps to determine the stop position of said shaft.

33. In a printing telegraph receiver, a rotatable type wheel providedwith a plurality of characters, a member having a helical series of armsless in number than the number of characters on said type wheel forcontrolling the rotation thereof, stop means cooperable with said armsfor controlling said member, and a signal responsive means forcontrolling said stop means.

34. In a selector, a rotatable shaft, a series of arms helicallyarranged around said shaft, each arm provided with a plurality ofabutting surfaces, and means cooperable with said surfaces to determinethe stop position of said shaft.

35. In a selector for stopping a rotatable shaft in any one of aplurality of character positions, a series of arms less in number thanthe number of character stop positions helically arranged around saidshaft, each arm provided with a plurality of abutting surfaces, andmeans cooperable with said surfaces to determine the stop position ofsaid shaft.

36. In a selector for stopping a rotatable shaft, a cylinder carried bysaid shaft having a helical series of arms each provided with aplurality of abutting surfaces, and means cooperable with said surfacesto determine the stop position of said shaft.

37. A selecting element comprising a series of spirally arranged stoparms each having an involute conformation and a plurality ofprogressively disposed abutments on each of said arms.

38. In a selector for stopping a rotatable shaft, a cylinder carried bysaid shaft comprising a series of spirally arranged stop arms eachhavingan involute conformation and a plurality of progressively disposedabutments on each of said arms, and a coordinately positionable stopmember cooperable with said abutments to determine the stop position ofsaid shaft.

39. In a printing telegraph receiver, a rotatable type Wheel, a memberhaving a helical series of serrated arms for controlling the rotationthereof, a stop element cooperable with said arms for controlling saidmember, and a signal responsive means for controlling said stop element.

40. In a printing telegraph receiver, a rotatable type wheel, a memberhaving a helical series of arms for controlling the rotation thereof,said arms having a plurality of serrations on their respectivefunctional edges, a stop element cooperable with said serrations'forcontrolling said member, and a signal responsive means for controllingsaid stop element.

41 In a printing telegraph receiver, a rotatable type wheel providedwith a plurality of characters, a member having a series of arms less innumber than the number of characters on said type wheel for controllingthe rotation thereof, said arms having a plurality of serrations ontheir functional edges, stop means cooperable with said serrations forcontrolling said member, and a signal responsive means for controllingsaid stop means.

42. In a printing telegraph receiver, a rotatable type wheel, a memberhaving a helical series of arms for controlling the rotation thereof,said arms having a plurality of serrations on their respectivefunctional edges, stop means cooperable with said serrations forcontrolling said member,-and a signal responsive means for controllingsaid stop means.

43. In a telegraph receiver, a rotatable type wheel provided with aplurality of characters, means having a series of elements less innumber than the number of characters on said type wheel and arranged ina plurality of planes for controlling the rotation thereof, stop meanscooperable with said elements for controlling said means, and a signalresponsive means for controlling said stop means.

ALBERT I-I. REIBER.

